G3PX
G3PX
19
If any of the following models is used and the actual load current is
50% of the maximum rated load current or lower, increase the num-
ber of turns of the wire around the CT Unit.
G3PX-20EHN Series (multi-heater burnout detective models)
G3PX-20EC Series (constant current)
For example, make two turns if the actual load current is 50% of the
maximum rated load current and four turns if the actual load current
is 25% of the maximum rated load current.
If the G3PX is a constant current model, do not increase the number
of turns of the wire around the CT Unit excessively, otherwise the
overcurrent detective function may operate by mistake.
External DUTY Adjuster
Use the External DUTY Adjuster with a resistance of 2 k
Ω
or that
with a resistance of 3 k
Ω
according to the G3PX-series model in
use. Refer to the following combinations.
G3PX-2
j
EH Series: G32X-V3K (3 k
Ω
)
G3PX-2
j
0EUN Series
G3PX-2
j
0EC Series
Base-up Function
If the model in use has the model number suffix “EUN,” the base-up
function is available.
The base-up output of the G3PX with a temperature controller out-
put of 0 mA (i.e., the temperature controller is turned off) and that of
the G3PX with a temperature controller output of 4 mA are different
from each other.
Power Device Cartridge
Do not apply power to the G3PX with the Power Device Cartridge
dismounted.
Heater Burnout Detection
EH and EHN Models
The heater burnout detective function is not available for detecting
the phase less than the following.
G3PX-20EH Series:
π
/8 or less
G3PX-20EHN Series: Approx.
π
/6 or less
Phase not detectable
Power Supply
Single-phase Models Only
Do not apply 200 V to the 100-V terminals, otherwise the thermal
fuse of the built-in transformer will be blown and the G3PX will not
operate.
Others
It is not possible to use three single-phase models for three-phase
load control.
If three-phase power supply is used for single-phase models oper-
ating in parallel, make sure that the two phases supplied to all the
single-phase models are the same.
Troubleshooting
Check the following if the G3PX does not operate or has difficulty in
temperature control.
•
The load does not turn on with 100% input.
Check the default internal ramp setting.
DUTY
Make sure that the adjust-
er is set to the farthest
clockwise position.
Also check the current limit adjuster if the G3PX is a constant DC
model.
CUR LIM
•
The G3PX does not operate or is in abnormal operation.
Make sure that all input terminals are connected properly with no
mistakes in polarity.
Make sure that the internal DUTY adjuster is not set to the farthest
clockwise position.
Make sure that the frequency used by the G3PX (i.e., 50 or 60 Hz)
is set properly. (This applies to the EC, and EHN models.)
•
The G3PX malfunctions if the external adjusters are turned.
Make sure that the numbers on the external adjusters coincide
with the corresponding terminal numbers on the G3PX.
Make sure that the 2-k
Ω
and 3-k
Ω
DUTY adjusters are connected
correctly.
External main setting
External duty setting
(Positive)
Note:
1, 2, 3, 5, 6, and 7 are terminal
numbers of the G3PX.
(Positive)
•
Temperature control with a Voltage-output Temperature
Controller is not smooth.
Make sure that the controlled soft-start up/down time has been
adjusted properly. If not, turn the TIME adjuster counterclockwise
to the minimum setting to reduce the controlled start-up/down
time.
TIME
TIME
Input signal
Controlled
soft-start
up
Reduce this period.
Input signal
Controlled
soft-start
up
•
The Level indicator is not OFF with a 0% input signal
(G3PX-2
j
0EUN Series).
Make sure that the BASE UP adjuster has been turned counter-
clockwise to the minimum setting.
BASE UP
Make sure that the adjuster
is turned counterclockwise
to the minimum setting.
